(i) (-7/5xy2z) × (13/3x2yz2)
= -91/15 × x1+2 × y2+1 × z1+2
= -91/15x3y3z3
(ii) (-24/25x3z) × (-15/16xz2y)
= 18/20 × x3+1 × z1+2 × y
= 9/10x4z3y
(iii) (-1/27a2b2) × (9/2a3b2c2)
= -1/6 x a2+3 × b2+2 × c2
= -1/6a5b4c2
(iv) (-7xy) × (1/4x2yz)
= -7/4 × x1+2 × y1+1 × z
= -7/4x3y2z
